Insulator



Feb. 16, 1937. JONES 2,071,231

INSULATOR Filed Oct. 8, 1954 Inventor Attorney 1 Patented Feb. 16, 1937UNITED STATES PATENT OFFICE INSULATOR Hinkley, Calif.

Application October 8, 1934, Serial No. 747,434

5 Claims.

This invention relates to insulators for electric conductors and has asits object the provision of, an insulator having as an integral partthereof a metal clamp for the attachment of an electric conductor orWire to the insulator.

My insulator has the following advantages over types now in use:

It eliminates induction leakage occasioned by coils formed by tie wires.

.It increases.- arcing radius between conductor and ground contact.

It eliminates the building up of static within confines of groove inwhich tie wires are laid.

The major cause for surface leakage in insulators now in use is fromsmall particles of metal that are removed by erosion from wiresoccasioned by expansion and contraction and by swinging in wind. Theseminute particles adhere to the surface of the insulator forming a pathof conductive matter which superinduces surface leakage. My insulatoreliminates this as the wire cannot creep to cause friction betweenconductor and insulator.

Wires will constantly maintain their initial length between supports.

It facilitates the initial operation of installation and lowers the costof maintenance.

In its construction, the member including the lower jaw is built withand into the insulator ,6 body and nothing protrudes to hinder packingand shipping .of the insulator.

In the process of clamping the conductor to my insulator no forcenecessary to hold the wire in clamped relation is directed against thedielectric from which the insulator body is made.

It is adaptable efficiently and economically to lines of voice frequencyas well as to lines of high voltage.

As no static can build up within the confines of the unit, there can beno corona discharge and no interference with radio waves.

The invention, together with its objects and advantages, will be bestunderstood from a study of the following description, taken inconnection 45 with the accompanying drawing, wherein:

Figure 1 is an elevational view of a portion of an insulator having thatpart thereof forming the clamp associated therewith, the membercomprising the clamp being shown in section, and

50 parts of the insulator body being broken away. The lower part orskirt of the insulator is not i shown, as I do not limit myself to anyspecific shape of insulator skirt. Any form of insulator skirt may beemployed and still be within the 55 scope of my invention.

Figure 2 is an exploded view of that part of the insulator forming theclamp.

Figure 3 is an elevational view of that part of the insulator formingthe clamp with the parts thereof assembled.

Figure 4 is a perspective view of a jaw forming part of the clamp.

Referring to the drawing by reference numerals, it will be seen that 5indicates generally a vitreous or ceramic insulator of knownconstruction. In accordance with the present invention, the dielectricbody of the insulator has fixedly embedded in the crown thereof and inimmediate contact therewith an internally threaded socket 6 which at itslower end is provided with a point I and above the point I with lateralprojections or fins 8 serving to securely anchor the socket within thebody of the insulator. The spaced fins 8 allow the viscous material fromwhich the insulator is cast to pass unobstructed into the mold withoutforming air bubbles or pockets and congeal about the socket member toform a strong anchorage in the process of manufacture. At the upper endthereof, the socket is formed into an en bloc therewith a concavo-convexhead or jaw 9 which projects from all sides of the socket and whoseunderface is concave so as to present an edge I0 that is embedded withinand in immediate contact with the dielectric material of the insulatorbody in a manner clearly shown in Figure 1. The jaw 9 laterally ofv thesocket 6 is formed with a toothed gripping concave channel II and agroove ll extending lengthwise of the jaw 9 at the side of the concaveface ll opposite the socket 6. Socket 6 is eccentric with respect to thehead or jaw 9. The dielectric body 5 is molded about the socket 8 andhead 9 while the body material is in the molten or plastic condition.

A removable jaw I3 is provided with a gripping concave channel l4cooperable with the concave channel II of the jaw 9 for clampingtherebetween the electric conductor or wire l5 as shown in Figure 1. Atone end thereof the jaw I3 is provided with a tongue l6 that fits in thegroove I! in a manner to retain the jaw l3 against rotative movement,and to adapt the clamp for use on conductors of different sizes.

The jaw l3 also has an apertured end thereof alining with the bore ofthe socket 6 so as to accommodate a clamping screw II! that is adaptedto be screwed into the socket 6 as clearly shown in Figure 1. A splitspring washer I9 is disposed about the screw l8 between the head of thescrew and the top face of the jaw l3 and this washer serves to lock thescrew when the same has been threaded home inwardly of the socket 6.

A feature of the present invention is the mushroom shaped jaw-equippedmember comprising head 9 and socket 6, being constructed of one and thesame piece of metal, and so shaped that when the strain of the load isplaced upon it, it will act in the nature of a complex inverse lever,the power being at 15, the fulcrum at 20 and the complex weights at land I6, offering the resistance of such regardless of the direction inwhich the pull or power may be applied. Thus, with this construction,before the end 1 of the embedded member can yield in any direction tothe power or pull of the line wire fromany direction, half of theconcave surface of the mushroom head 9 must also move downward andtowards the center of the insulator body in which it is embedded. Theinsulator, if sufficient strain were put upon it in a manner in whichits construction is purposed to resist, would break at the pin attachingit to the pole before it would collapse where the member is embedded.

What is claimed is:

1. An insulator comprising a dielectric body adapted for attachment to asupport, a conductor wire clamp including coacting removable and fixedjaws the latter being anchored to the dielectric body, said fixed jawcomprising a head formed with a recess on the face confronting thedielectric body, a socket member depending from the head inecce'ntricrelation with respect to the recess, and said recess and said socketmember being in contact with thedielectric body.

2. An insulator comprising a congealed thermoplastic dielectric bodyadapted for attachment to a support, a conductor wire clamp includingcoacting removable and fixed jaws the latter being anchored to thedielectric body, said fixed jaw comprising a head and a socket memberdepending therefrom, said head formed with a recess confronting thedielectric body, said socket member disposed in eccentric relation withrespect to the recess, and said dielectric body congealed about thesocket member and against the walls of the recess in the head.

3. An insulator comprising a congealed thermoplastic dielectric bodyadapted for attachment to a support, a conductor wire clamp includingcoacting removable and fixedjaws, said fixed jaw comprising aconcavo-convex head and an integral socket member depending therefrom,the dielectric body being congealed against the concave face of thehead, said socket member disposed in eccentric relation with respect tothe recess, said socket member formed with a point on the free end andradially extending circumferentially spaced fins adjacent the free end;and said dielectric body being congealed about the socket member, finsand point.

4. An insulator comprising a congealed thermoplastic dielectric bodyadapted for attachment to a support, a conductor wire clamp including afixed jaw and 'a removable jaw, said fixed jaw formed with a head havingupper and lower faces and a socket member depending in eccentricrelation with respect to the head, said head formed with a recess in thelower face, said dielectric body congealed about the socket member andagainst the walls of the recess in the lower face, said head and socketmember formed with a threaded socket, on the upper face said head beingformed with a serrated conductor wire channel laterally of the threadedsocket and a groove extending outwardly from said channel, a bolt fordetachable mounting in said threaded socket, said removable jaw mountedon the bolt and formed with a serrated channel and a tongue extendingoutwardly therefrom registering with the channel and groove on the headof the fixed jaw whereby a conductor wire is clamped in the channels andthe removable jaw is prevented from turning on the bolt.

5. An insulator comprising a congealed thermoplastic dielectric bodyadapted for attachment to a support, a conductor wire clamp includingcoacting removable and fixed jaws the latter being anchored to thedielectric body, said fixed jaw comprising a concavo-convex head and anintegral socket member depending in eccentric relation with respect tothe concaved face of the head, said socket member formed with a point onthe free end and radially extending circumferentially spaced finsadjacent the free end, said dielectric body congealed against theconcaved face of the head and about the fins and the point, said headand socket member formed with a threaded socket, the convex face of saidhead formed with a serrated conductor wire channel laterally of thethreaded socket and a groove extending outwardly from said channel, abolt for detachable mounting in said threaded socket, and said removablejaw mounted on the bolt and formed with a serrated channel and a tongueextending outwardly therefrom registering with the channel and groove onthe head of the fixed jaw whereby a conductor wire is clamped in thechannels and the removable jaw is prevented from turning on the bolt.

ROBERT D. JONES.

